Parallelometer



Mar. 6, 1923. 1,447,774.

A. J. FORTUNATI.

PARALLELOMETER.

FILED NOV, 29, 1919.

INVENTOR.

,AwxanderIZbrfuna/tz;

g ATTORNEY ALEXANDER'J'. ronrunnrr, or BOSTON, mnssncnusnrrs;

PARALLELOMETER.

Application filed November 29, 1919. Serial No. $41 ,490.

To all whom it may. concern:

Be it known that I, ALEXANDER J..Fonro- NATI, a citizen ofthe'UnitedStates, and resident of Boston, inthe county of Suffolk and State ofMassachusetts, have invented certain new and useful Improvements inParallelometers, of. which the following is a specification.

This invention relates to dental instruments ofprecision and especiallyto parallelometers for securing and transferring delicate measurementsin dental work, and its object is to provide a support to be secured ina dental cast and universally carried measuring points which areadjustable with relation to each other, both vertically and horizontallyand to be removed to effect accurate reproductive work. These and otherdetails and objectsare more fully described in the specification setforth in the appended claims, and illustrated inthe accompanyingdrawings, whereln:

Fig. 1 is an elevation of the improved device,

Fig. 2 is a view from the opposite side of the instrument Fig. 3 is anend view,

Fig. 4 is a plan view,

Fig. 5 is a detail of the baseand swivel in section,

Fig. 6 is an enlarged detail view of the adjusting beam and its screw.

Devices for measuring where great delicacy 1s necessary are many,especlally in micrometers, callipers, beam compasses and such wheremembers are adapted to slowly move with relation to each other and carrypointed rods or pins which are used to measure distances or dimensionsaccurately and to transfer these measurement from the teeth to a cast toprepare dental bridges, plates, etc.

In the present invention, the parallelometer is adapted to be firmlyanchored in the cast on which the work is tobe built and com prises thebase 10, with notched flanges 11, at its lower end and split andsocketed at its upper end to contain a swivel ball 12, which is confinedin its socket by the cap 13.

As the base 10 is inserted in the cast to a limited extent only, theflanges and notches materially assist in giving the base. a firmanchorage.

The ball 12, is the lower end of a swivel post 1 1, bored out to containthe stem 15, of

the column 16, the former being shown in dottedlines in. Fig. 1. At thetop of post 14. is a head 17 onthe top of which is located the column16' and that is adapted to give said column a firm foundation. s

The column 16 passes through a block to which it issecured by means of aclamping screw 20 and the block is made of two pieces 18 and 2 1- heldtogether by screws 25, the piece 18 having a vertical channel for thesaid column while the piece 24: has a horizontal channel for the beam 19that is adapted-to play through the block but be moved and held by ascrew 21 whose threaded portion plays in a perforation in the part 2-1and WllOSe end is swivelled by means of the nut 22 in the head 23 of thebeam 19. When this latter screw is rotated it moves with the beam 19either to one side or the other.

The plate 18 has at each end perforations, one to receive the slotted orsplit plug 26 that is adapted to hold or carry an attachment, while theother perforation receives the plug 27. A third plug, 27, is carried bythe head 23 and set screws 28 and 29 are provided to hold the plugsafter they have been adjusted vertically. The swivel post 14 alsocarries the set screw 30 to enter a groove around the stem of the column16 and connects the two.

This device is preferably used in dental work and the base 10 isinserted in a cast leaving the various plugs free to be moved to securedesired measurementsand parallelisms to be reproduced in bridges andplates and the swivel 12 affords means for hastily dropping the plugsinto position if desired or to move them in any direction. The test plug26 may be used as an initial marker while the others are used to measurespace therefrom.

By means of the above described device. the plugs may be set at anydesired angle and measurements taken and the said plugs may then besecured to any casts in the course of preparation and the measurementsapplied thereto. The parts are separable and may be removed or replacedat will, while the whole may be set by means of the base in a cast andthe parts rigidly secured to perform their function.

What I claim is:

1. In a parallelometer, the combination of an upright, a plurality ofplugs secured in said upright,-a beam on said upright, a plug adjustablein said beam, means for moving thebeam on the upright, a base for theupa base, an upright connected with the base by, a universal jointQamovable beam supported by the upright, a plug carried by the beam andadapted to be moved towards or from the plugs carried by theuprightyancl means for holding the plugs when adjusted. v 3; Inparallelometers, the combination of an upright, a base; a universaljoint connecting the upright with the base, plugs adj ustablycarried byand parallel with the upright, means for holding the plugs in adjustment, a sliding beam on the upright, an adjustable plug on the beamand parallel with the above mentioned plugs and means for sliding thebeam and its plugs on the upright.

a. In parallelometers, the combination of a base havinga socket, anupright having at its lower-end a ballfor the socket, parallel plugsadjustable in the upper end of the upright, a sliding beampl'aying inthe upright anadjustable plug in said beam and parallel with the plugsin the upright, adjusting means for the beam to move its plug to andfrom the plugs in the upright, and means for holding all the plugs-whenadjusted Ion gitudinally. j 7

Signed at New York in the county of New York and State of New York this10th day of November A. D. 1919; I

ALEXANDER J. FORTUNATI.

'Witnesses;

A. W. BAKE J Aims F. DUHAMEL.

